Submission #1173293

#	Time	Username	Problem	Language	Result	Execution time	Memory
1173293		thinknoexit	Strange Device (APIO19_strange_device)	C++20	10 / 100	281 ms	16964 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const ll INF = 1e18 + 2;
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    // every A / gcd(A, B+1) is the same
    int n;
    ll A, B;
    cin >> n >> A >> B;
    // B++;
    ll one = A;
    if (one >= (INF + B - 1) / B) one = INF;
    else one *= B;
    // cout << one << '\n';
    vector<pair<int, int>> sweep;
    for (int i = 1;i <= n;i++) {
        ll l, r;
        cin >> l >> r;
        if (r - l + 1 >= one) {
            cout << one << '\n';
            return 0;
        }
        l %= one, r %= one;
        // cout << l << ' ' << r << '\n';
        if (l <= r) {
            sweep.push_back({ l, 1 });
            sweep.push_back({ r + 1, -1 });
        }
        else {
            sweep.push_back({ 0, 1 });
            sweep.push_back({ r + 1, -1 });
            sweep.push_back({ l, 1 });
            sweep.push_back({ one, -1 });
        }
    }
    sort(sweep.begin(), sweep.end());
    ll ans = 0;
    int now = 0;
    for (int i = 0, j;i < (int)sweep.size();i = j) {
        for (j = i;j < (int)sweep.size() && sweep[i].first == sweep[j].first; j++) {
            now += sweep[j].second;
        }
        if (now > 0) {
            ans += sweep[j].first - sweep[i].first;
        }
    }
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30